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<h2><span class="refentrytitle">Class template apply_visitor_delayed_t</span></h2>
<p>boost::apply_visitor_delayed_t — Adapts a visitor for use as a function object.</p>
</div>
<h2 class="refsynopsisdiv-title">Synopsis</h2>
<div class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../variant/reference.html#header.boost.variant.apply_visitor_hpp" title="Header &lt;boost/variant/apply_visitor.hpp&gt;">boost/variant/apply_visitor.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Visitor<span class="special">&gt;</span> 
<span class="keyword">class</span> <a class="link" href="apply_visitor_delayed_t.html" title="Class template apply_visitor_delayed_t">apply_visitor_delayed_t</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Visitor</span><span class="special">::</span><span class="identifier">result_type</span> <a name="boost.apply_visitor_delayed_t.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="apply_visitor_delayed_t.html#boost.apply_visitor_delayed_tconstruct-copy-destruct">construct/copy/destruct</a></span>
  <span class="keyword">explicit</span> <a class="link" href="apply_visitor_delayed_t.html#id-1_3_44_5_7_1_1_5-bb"><span class="identifier">apply_visitor_delayed_t</span></a><span class="special">(</span><span class="identifier">Visitor</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="apply_visitor_delayed_t.html#id-1_3_44_5_7_1_1_6-bb">function object interface</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ... Variant<span class="special">&gt;</span> <span class="identifier">result_type</span> <a class="link" href="apply_visitor_delayed_t.html#id-1_3_44_5_7_1_1_6_1_1-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Variant</span><span class="special">&amp;</span><span class="special">...</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Variant<span class="special">&gt;</span> <span class="identifier">result_type</span> <a class="link" href="apply_visitor_delayed_t.html#id-1_3_44_5_7_1_1_6_1_2-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Variant</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Variant1<span class="special">,</span> <span class="keyword">typename</span> Variant2<span class="special">&gt;</span> 
    <span class="identifier">result_type</span> <a class="link" href="apply_visitor_delayed_t.html#id-1_3_44_5_7_1_1_6_1_3-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Variant1</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">Variant2</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.44.5.8.3.4"></a><h2>Description</h2>
<p>Adapts the function given at construction for use as a
          function object. This is useful, for example, when one needs to
          operate on each element of a sequence of variant objects using a
          standard library algorithm such as
          <code class="computeroutput">std::for_each</code>.</p>
<p>See the "visitor-only" form of
          <code class="computeroutput"><a class="link" href="apply_visitor.html" title="Function apply_visitor">apply_visitor</a></code> for a simple
          way to create <code class="computeroutput">apply_visitor_delayed_t</code> objects.</p>
<p>See <code class="computeroutput"><a class="link" href="apply_visit_1_3_44_5_7_1_2.html" title="Class template apply_visitor_delayed_cpp14_t">apply_visitor_delayed_cpp14_t</a></code>
            which is used on C++14 compatible compilers when <code class="computeroutput">Visitor</code> has no
            <code class="computeroutput">result_type</code> typedef.</p>
<div class="refsect2">
<a name="id-1.3.44.5.8.3.4.5"></a><h3>
<a name="boost.apply_visitor_delayed_tconstruct-copy-destruct"></a><code class="computeroutput">apply_visitor_delayed_t</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_44_5_7_1_1_5-bb"></a><span class="identifier">apply_visitor_delayed_t</span><span class="special">(</span><span class="identifier">Visitor</span> <span class="special">&amp;</span> visitor<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Effects:</span></p></td>
<td>Constructs the function object with the given
            visitor.</td>
</tr></tbody>
</table></div>
</li></ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.44.5.8.3.4.6"></a><h3>
<a name="id-1_3_44_5_7_1_1_6-bb"></a><code class="computeroutput">apply_visitor_delayed_t</code> function object interface</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><a name="id-1_3_44_5_7_1_1_6_1-bb"></a><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ... Variant<span class="special">&gt;</span> <span class="identifier">result_type</span> <a name="id-1_3_44_5_7_1_1_6_1_1-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Variant</span><span class="special">&amp;</span><span class="special">...</span> operand<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Variant<span class="special">&gt;</span> <span class="identifier">result_type</span> <a name="id-1_3_44_5_7_1_1_6_1_2-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Variant</span> <span class="special">&amp;</span> operand<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Variant1<span class="special">,</span> <span class="keyword">typename</span> Variant2<span class="special">&gt;</span> 
  <span class="identifier">result_type</span> <a name="id-1_3_44_5_7_1_1_6_1_3-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Variant1</span> <span class="special">&amp;</span> operand1<span class="special">,</span> <span class="identifier">Variant2</span> <span class="special">&amp;</span> operand2<span class="special">)</span><span class="special">;</span></pre>Function call operator.<p class="simpara">Invokes
            <code class="computeroutput"><a class="link" href="apply_visitor.html" title="Function apply_visitor">apply_visitor</a></code> on the
            stored visitor using the given operands.</p>
</li></ol></div>
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<div class="copyright-footer">Copyright © 2002, 2003 Eric Friedman, Itay Maman<br>Copyright © 2014-2024 Antony Polukhin<p>Distributed under the Boost Software License, Version 1.0.
    (See accompanying file <code class="filename">LICENSE_1_0.txt</code> or copy at 
    <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
    </p>
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